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Is this double pointer correct?

General and Gameplay Programming Programming

Started by dynamicman October 30, 2001 06:00 PM

2 comments, last by dynamicman 22 years, 5 months ago

dynamicman

122

Author

October 30, 2001 06:00 PM

I just need to understand a bit more about double pointers... I want a pointer that points to another pointer thats an array of pointers to stuff...

    
CStuff** ppstuff;
CStuff* pstuff = new CStuff[15];

Then I'm not sure if I should do this...

  
ppstuff = &pstuff

or...

  
(*ppstuff) = pstuff;

To access the array I use this...

  
ppstuff[4]->method();

is that correct? whould this last code access the 5th pointer in my array? [/source] Edited by - dynamicman on October 30, 2001 7:01:18 PM

Omaha

100

October 30, 2001 10:42 PM

Well, your second assignment, (*ppstuff) = pstuff, is a recipe for disaster, since you''re basically trying to assign the value of pstuff to the memory pointed to by ppstuff--which is uninitialized.

Anonymous

October 30, 2001 11:04 PM

"(*ppstuff) = pstuff, is a recipe for disaster."

Are u sure?

*ppstuff is an address(a pointer to CStuff), and dman here is assigning it with pstuff(a pointer to CStuff), also an address ''which'' he has already initilised via the statement "CStuff* pstuff = new CStuff[15];".

Dynamicman is not assigning values, but referencing addresses here.

Anonymous

October 31, 2001 05:25 AM

ppstuff is null so *ppstuff is invalid. The first form is correct. The call ppstuff[4]->method() is also correct.

Is this double pointer correct?

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Is this double pointer correct?

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